De-superheating Control Valves & Stations
DSH series Desuperheater control valve reduces the
superheated steam temperature by injecting cooling
water in to it. Due to heat transfer principle the water
absorb sufficient heat for vaporization to maintain
temperature close to that of saturation. The operation is quite simple , The spray water quantity is
controlled with an external control valve. Spray nozzle
which received the feedback / signals from controller and
downstream temperature sensor. Temperature reduction
occurs due to disperse of the minute water particle and
atomizing steam counter to the flow of superheated
steam , enabling the fine mist to be easily evaporated.
Performance & Design Features:
Fixed Nozzle type
Used for application with near constant load
Most simple & economical Desuperheater
Capable of maintaining final temp. of 5
Used when pressure difference between steam line and spray water is high.
Maximum turndown 3:1
Venturi Nozzle type
Compact & Economical in design.
Difference between spray water and stem line is minimal
Better mixing of spray water
final temp. up to 6 C of saturation
Maximum turndown 10:1
Best design among all de-superheater Valve
Widely used for application with high load fluctuations
High performance of spray nozzle assembly.
Excellent down stream temp. control
High turn down ration of 16:1
Mechanical atomizing type Desuperheaters are generally
used to lowering the temperature of superheated steam
to the required set point by injecting atomized water in to
the superheated steam flow with spray Nozzle.